JP2007134005A - Method of recording in optical disk drive, and optical disk drive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of recording in an optical disk drive and the optical disk drive where the precision of an optimal value of recording power obtained by optimization processing is improved by accurately grasping a value β which has to be corrected when carrying out optimization processing of the recording power. <P>SOLUTION: When carrying out the optimization processing of the recording power, a plurality of values β based on a plurality of recording powers are calculated, and at least a part of the calculated values β are compared based on a prescribed formula, in the method of recording in the optical disk drive. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a recording method of an optical disc apparatus for recording information on an optical disc and an optical disc apparatus.

  Optical disk devices are actively being developed for various applications and high performance. In particular, recently, optical disk devices have been increased in speed, reduced in weight, and reduced in weight, and high-speed recording control has been required for optical disks.

  Here, the configuration of the optical pickup control unit of the optical disc apparatus will be described with reference to FIG.

  FIG. 6 is a block diagram of a recording power control system in a conventional optical disc apparatus. In FIG. 6, 1 is an optical disk, 2 is an optical pickup, 3 is a reproduction signal detection circuit, 4 is a spindle motor, 5 is a traverse mechanism, 6 is a laser drive circuit, 7 is a recording control circuit, 8 is a servo control circuit, and 9 is A β detection circuit, 10 is a control circuit, and 11 is a pickup module.

  The pickup module 11 moves the spindle motor 4 that rotates the optical disc 1, the optical pickup 2 that records or reproduces information signals of the optical disc 1, and the carriage on which the optical pickup 2 is mounted in the radial direction of the optical disc 1. It is comprised by the traverse mechanism 5 for making it do.

  The reproduction signal detection circuit 3 generates analog signals such as an RF signal, a focus error signal, and a tracking error signal based on a signal output from an optical sensor (not shown) inside the optical pickup 2. The generated focus error signal and tracking error signal are sent to the servo control circuit 8, and the RF signal is sent to the β detection circuit 9 and a reproduction signal processing unit (not shown).

  The servo control circuit 8 includes an ON / OFF circuit, an arithmetic circuit, a filter circuit, an amplifier circuit, and the like. Based on the focus error signal and tracking error signal sent thereto, an objective lens and a carriage provided in the optical pickup 2 Is generated and output to the optical pickup 2. The optical pickup 2 performs focus control and tracking control on the recording surface of the optical beam 1 and the light beam emitted from the objective lens provided in the optical pickup 2 based on the signal.

  The β detection circuit 9 calculates the β value from the transmitted RF signal, and uses this β value to optimize the recording power called OPC (Optimum Power Calibration) which is one of the recording optimization processes in the control circuit 10. Processing is performed, and a set value relating to the recording power is set in the recording control circuit 7. The recording control circuit 7 sends a signal to the laser drive circuit 6 based on the set value relating to the set recording power, and the laser drive circuit 6 controls the amount of laser light emitted from the optical pickup 2.

  The feed unit is composed of a feed motor, a gear, a screw shaft, and the like. The traverse mechanism 5 is moved by rotating the feed motor, and feed motor pulses are periodically output from the feed motor.

As a prior example in this field, there is (Patent Document 1) and the like.
Japanese Patent Laid-Open No. 10-31568

  When a signal is recorded on the optical disc 1, a recording power optimization process called OPC is usually performed prior to the recording in order to improve the recording performance.

  In the recording power optimization process, the calculated optimum value of the recording power is recorded in the test writing area provided on the optical disc 1 in order with a plurality of recording powers having different recording powers. It is calculated by reproducing the recorded signal. At this time, the β value is used as an index for obtaining the optimum value. The β value is defined by β = (A1 + A2) / (A1−A2) from the positive peak level A1 and the negative peak level A2 with respect to the AC reference voltage of the RF signal, and A1 + A2 is the positive amplitude and the negative amplitude. And A1-A2 is the amplitude. However, when a β value including an error exists for some reason, the true optimum value may not be calculated due to the influence of the β value including the error.

  Therefore, when a β value including an error exists, the conventional optical disc apparatus corrects the β value by the following method.

  7 and 8 are diagrams showing the relationship between the recording power and the β value in the conventional optical disc apparatus, in which the horizontal axis represents the recording power and the vertical axis represents the β value. Here, FIGS. 7A and 8A are diagrams immediately after the β value is calculated from the RF signal. FIGS. 7B and 8B are FIGS. 7A and 7B, respectively. A correction is made to a part of the β value shown in FIG. 7 and 8, 101 to 110, 114, 121 to 130, and 134 are β values.

  When the plurality of calculated β values are arranged in ascending or descending order using the recording power used to calculate the β value as an index, the β value relative to the recording power is usually found when there is a β value including an error. Since the change does not change by a combination of monotonic decrease or monotonous increase, the β value including the error can be specified to some extent by comparing with the β values calculated before and after that. That is, a β value including an error means that there is no value between β values located on both sides thereof.

  However, according to this method, even if there is only one β value that includes an error, two β values that may include an error are always detected. Conventionally, in order to avoid this, processing for correcting any one of β values that may contain an error, for example, processing for correcting the first detected β value, is performed. However, if this process is performed, there is a possibility that the β value that does not originally contain an error may be corrected, and the OPC may not operate correctly.

  For example, FIG. 7 shows a case where the β value including the error is the β value 104 and the arbitrary β value to be corrected is the β value 104. In FIG. 7A, among the calculated β values 101 to 110, β values detected as β values that may include an error are a β value 104 and a β value 105. At this time, the β value to be corrected is the β value 104, and the β value after correction is the β value 114 shown in FIG. 7B. In this case, the β value 101 to the β value 103, the β value 114, and the β value 105 to the β value 110 are arranged on a straight line as shown in FIG. It has been corrected.

  For example, FIG. 8 shows a case where the β value including the error is the β value 125 and the arbitrary β value to be corrected is the β value 124. In FIG. 8A, among the calculated β values 121 to 130, β values detected as β values that may include an error are a β value 124 and a β value 125. At this time, the β value to be corrected is the β value 124, and the corrected β value is set to the β value 134 shown in FIG. 8B. In this case, the β value 121 to the β value 123, the β value 134, the β value 125 to the β value 130 are not arranged on a straight line as shown in FIG. It is not corrected correctly.

  As described above, in the β value correction by the conventional method, the β value including an error may not be corrected correctly.

  The present invention has been made in order to solve the above-described problems. When performing the recording optimization process, the β value to be corrected can be correctly grasped, and the optimum value obtained by the recording power optimization process can be obtained. It is an object of the present invention to provide a recording method for an optical disc apparatus and an optical disc apparatus capable of improving accuracy.

  The present invention has been made to solve the above-described problem, and when performing the recording power optimization process, a plurality of β values are calculated based on a plurality of recording powers, and among the calculated β values, A recording method for an optical disc apparatus, wherein at least a part is compared based on a predetermined mathematical expression.

  Also, an RF signal based on a rotation drive means for rotating the optical disc, an optical pickup for recording information on the optical disc, a laser drive circuit for controlling the amount of laser light emitted from the optical pickup, and a signal obtained from the optical pickup A reproduction signal detection circuit that generates a β value, a β detection circuit that calculates a β value based on an RF signal, and a control unit that calculates the β value. When the control unit performs a recording power optimization process, a plurality of The optical disk apparatus is characterized in that a plurality of β values are calculated based on the recording power and at least a part of the calculated β values are compared based on a predetermined mathematical expression.

  In the present invention, when performing the recording power optimization process, the present invention calculates a plurality of β values based on a plurality of recording powers, and at least a part of the calculated β values is based on a predetermined mathematical formula. By comparing, it becomes possible to correctly detect the β value including the error.

  Therefore, when performing the recording power optimization process, the β value to be corrected can be correctly grasped, and the accuracy of the optimum value can be improved by the recording power optimization process, and the optical disk apparatus recording method An apparatus can be realized.

  According to the first aspect of the present invention, when performing the recording power optimization process, a plurality of β values are calculated based on the plurality of recording powers, and at least a part of the calculated β values is converted into a predetermined mathematical expression. The recording method of the optical disc apparatus is characterized in that the comparison is made based on the above. When performing the recording power optimization process, a plurality of β values based on a plurality of recording powers are calculated, and at least a part of the calculated β values is compared based on a predetermined mathematical formula, thereby generating an error. It is possible to correctly detect the β value including. Therefore, when performing the recording power optimization process, it is possible to correctly grasp the β value to be corrected, and to realize the recording method of the optical disc apparatus capable of improving the accuracy of the optimum value by the recording power optimization process can do.

  According to the second aspect of the present invention, when a plurality of calculated β values are arranged in ascending or descending order using the recording power used for calculating the β value as an index, at least three β values continuously increase monotonously. Or, the difference between two consecutive β values among the β values that are monotonically decreasing is defined as X, and the β value that appears against the monotonic increase or monotonic decrease that appears first, and the monotone that is located next to the β value. The difference between the β value that increases or decreases monotonically is defined as Y, and the β value that appears against the second monotonic increase or decrease, and the monotonic increase or decrease that is located next to the β value. 2. The optical disk apparatus recording method according to claim 1, wherein when a difference from a β value to be defined is defined as Z, a predetermined mathematical expression is represented by | 2X−Y |> | 2X−Z |. is there. By using | 2X−Y |> | 2X−Z | as the predetermined mathematical expression, it is possible to more reliably detect the β value including the error.

  In the invention according to claim 3, when a plurality of calculated β values are arranged in ascending or descending order using the recording power used for calculating the β value as an index, at least three β values continuously increase monotonously. Or, the difference between two consecutive β values among the β values that are monotonically decreasing is defined as X, and the β value that appears against the monotonic increase or monotonic decrease that appears first, and the monotone that is located next to the β value. The difference between the β value that increases or decreases monotonically is defined as Y, and the β value that appears against the second monotonic increase or decrease, and the monotonic increase or decrease that is located next to the β value. The predetermined mathematical formula is represented by 3X> Z> X or 3X> Y> X, where Z is defined as a difference from the β value to be calculated. This is a recording method of the optical disc apparatus. By using 3X> Z> X or 3X> Y> X as the predetermined mathematical expression, it is possible to more reliably detect the β value including the error.

  In the invention according to claim 4, when the expression | 2X−Y |> | 2X−Z | is satisfied and the expression 3X> Z> X is satisfied, the β value that is contrary to the monotonic increase or monotonic decrease that appears first. The method of recording an optical disc apparatus according to claim 2, wherein the recording is corrected. If the mathematical expression | 2X−Y |> | 2X−Z | is satisfied and the mathematical expression 3X> Z> X is satisfied, the error is corrected by correcting the β value that is contrary to the monotonic increase or monotonic decrease that appears first. Among the β values that may be included, a β value that includes an error can be easily determined.

  The invention according to claim 5 does not satisfy the expression | 2X−Y |> | 2X−Z | and satisfies the expression 3X> Y> X, and a β value that is contrary to the monotonic increase or decrease that appears second. The method of claim 2, wherein the recording method of the optical disc apparatus according to claim 2 is corrected. If the mathematical expression | 2X−Y |> | 2X−Z | is not satisfied and the mathematical expression 3X> Y> X is satisfied, by correcting the β value opposite to the second monotonic increase or monotonic decrease, The β value including the error can be easily determined from the β values that may include the error.

  The invention according to claim 6 is obtained from a rotation driving means for rotating an optical disc, an optical pickup for recording information on the optical disc, a laser driving circuit for controlling the amount of laser light emitted from the optical pickup, and the optical pickup. A reproduction signal detection circuit that generates an RF signal based on a signal, a β detection circuit that calculates a β value based on the RF signal, and a control unit that calculates the β value, and the control unit optimizes recording power When performing the above, the optical disk apparatus is characterized in that a plurality of β values are calculated based on a plurality of recording powers, and at least a part of the calculated β values are compared based on a predetermined mathematical expression. By performing a recording power optimization process, the control unit calculates a plurality of β values based on a plurality of recording powers, and compares at least a part of the calculated β values based on a predetermined mathematical formula. Therefore, it is possible to correctly detect the β value including the error. Therefore, it is possible to realize an optical disc apparatus capable of correctly grasping the β value to be corrected when performing the recording power optimization process and improving the accuracy of the optimum value by the recording power optimization process. it can.

  In the invention according to claim 7, when the plurality of calculated β values are arranged in ascending or descending order using the recording power used for calculating the β value as an index, at least three β values continuously increase monotonously or The difference between two consecutive β values among monotonically decreasing β values is defined as X, the first monotonic increase or monotonic decrease β value that appears first, and the monotonic increase that is located next to the β value. Alternatively, the difference from the β value that monotonically decreases is defined as Y, the β value that appears secondly against the monotonic increase or monotonic decrease, and the monotone increase or monotonic decrease that is located next to the β value. 7. The optical disk apparatus according to claim 6, wherein when the difference from the β value is defined as Z, the predetermined mathematical expression is represented by | 2X−Y |> | 2X−Z |. By using | 2X−Y |> | 2X−Z | as the predetermined mathematical expression, it is possible to more reliably detect the β value including the error.

  In the invention according to claim 8, when the plurality of calculated β values are arranged in ascending or descending order using the recording power used for calculating the β value as an index, at least three β values continuously increase monotonously. Or, the difference between two consecutive β values among the β values that are monotonically decreasing is defined as X, and the β value that appears against the monotonic increase or monotonic decrease that appears first, and the monotone that is located next to the β value. The difference between the β value that increases or decreases monotonically is defined as Y, and the β value that appears against the second monotonic increase or decrease, and the monotonic increase or decrease that is located next to the β value. The predetermined mathematical formula is represented by 3X> Z> X or 3X> Y> X, where Z is defined as a difference from the β value to be performed. This is an optical disc device. By using 3X> Z> X or 3X> Y> X in a predetermined mathematical expression, it is possible to more reliably detect a β value including an error.

(Embodiment 1)
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  Here, a recording power control system of the optical disc apparatus according to the embodiment of the present invention will be described with reference to FIG.

  FIG. 1 is a block diagram of a recording power control system of an optical disc apparatus according to an embodiment of the present invention. In FIG. 1, 1 is an optical disk, 2 is an optical pickup, 3 is a reproduction signal detection circuit, 4 is a spindle motor, 5 is a traverse mechanism, 6 is a laser drive circuit, 7 is a recording control circuit, 8 is a servo control circuit, 9 is A β detection circuit, 10 is a control circuit, and 11 is a pickup module.

  The pickup module 11 moves the spindle motor 4 that rotates the optical disc 1, the optical pickup 2 that records or reproduces information signals of the optical disc 1, and the carriage on which the optical pickup 2 is mounted in the radial direction of the optical disc 1. It is comprised by the traverse mechanism 5 for making it do.

  The reproduction signal detection circuit 3 generates analog signals such as an RF signal, a focus error signal, and a tracking error signal based on a signal output from an optical sensor (not shown) inside the optical pickup 2. The generated focus error signal and tracking error signal are sent to the servo control circuit 8, and the RF signal is sent to the β detection circuit 9 and a reproduction signal processing unit (not shown).

  The servo control circuit 8 includes an ON / OFF circuit, an arithmetic circuit, a filter circuit, an amplifier circuit, and the like. Based on the focus error signal and tracking error signal sent thereto, an objective lens and a carriage provided in the optical pickup 2 Is generated and output to the optical pickup 2. The optical pickup 2 performs focus control and tracking control on the recording surface of the optical beam 1 and the light beam emitted from the objective lens provided in the optical pickup 2 based on the signal.

  The β detection circuit 9 calculates a β value from the transmitted RF signal, and a recording power optimization process called OPC (Optimum Power Calibration) is performed by the control circuit 10 using this β value, and settings relating to the recording power are performed. A value is set in the recording control circuit 7. The recording control circuit 7 sends a signal to the laser drive circuit 6 based on the set value relating to the set recording power, and the laser drive circuit 6 controls the amount of laser light emitted from the optical pickup 2.

  The feed unit is composed of a feed motor, a gear, a screw shaft, and the like. The traverse mechanism 5 is moved by rotating the feed motor, and feed motor pulses are periodically output from the feed motor.

  The control circuit 10 constitutes a control unit of the present invention, and signals sent from the reproduction signal detection circuit 3, laser drive circuit 6, recording control circuit 7, servo control circuit 8, and β detection circuit 9 are inputted. A signal calculation process or the like is performed, the result (signal) of this calculation process is sent to each part, and each part is driven and processed to control each part. Although detailed description and illustration are omitted, the control circuit 10 includes at least an arithmetic processing device such as a CPU and MPU having an arithmetic function, and a storage device such as a ROM and RAM.

  Here, a signal flow of the optical disc apparatus according to the present invention will be described.

  The signal flow during recording of the optical disk apparatus of the present invention is to record information on the optical disk 1 by operating the optical pickup 2 via the recording control circuit 7 and the laser driving circuit 6 based on the recording command of the control circuit 10. . The signal flow during reproduction of the optical disk apparatus of the present invention is such that the information recorded on the optical disk 1 is read by the optical pickup 2 and the control circuit 10 transmits the information via the reproduction signal detection circuit 3 and β detection circuit 9. Get it. Therefore, in the optical disc apparatus of the present invention that performs the recording power optimization process by repeatedly performing recording and reproduction, the recording power optimization process is performed by repeatedly performing the above-described signal flow.

  Next, the recording power optimization process of the optical disc apparatus according to the embodiment of the present invention will be described.

  FIG. 2 is a flowchart showing a recording power optimization process of the optical disc apparatus according to the embodiment of the present invention.

  When the optical disc 1 is mounted on the optical disc apparatus, the spindle motor 4 is rotated, the laser of the optical pickup 2 is emitted, focus servo and tracking servo are applied, and recording power optimization processing called OPC is started (S1). .

  In the recording power optimization process, first, the control circuit 10 sets ten types of setting values having different recording powers in the recording control circuit 7. The recording control circuit 7 sequentially performs a certain amount of recording in the test writing area of the optical disc 1 via the laser drive circuit 6 and the optical pickup 2 based on the set 10 kinds of set values (S2).

  Next, the control circuit 10 sequentially reproduces the 10 types of recordings recorded in the test writing area of the optical disc 1 and generates an RF signal by the reproduction signal detection circuit 3 based on the reflected light obtained from the optical pickup 2. The β value is calculated based on the RF signal generated by the β detection circuit 9 (S3).

  The calculated 10 types of β values are sent to the control circuit 10, and the calculated plurality of β values are arranged in ascending or descending order in a table prepared in advance using the recording power used to calculate the β values as an index. It is done. In the present embodiment, when a certain amount of recording is sequentially performed in the trial writing area of the optical disc 1, the recording power is changed stepwise in ascending or descending order, so the recording power used to calculate the β value is As an index, the process of rearranging the calculated β values in ascending or descending order can be omitted.

  The control circuit 10 confirms the monotonic increase or monotonic decrease of the β value with respect to the change in recording power (S4). Here, when three or more β values that violate the monotonous increase or monotonous decrease with respect to the change in the recording power are generated (S5), the operation returns to the operation of Step 2 (S2), and thereafter violates the monotonous increase or monotonous decrease. Steps 2 (S2) to 5 (S5) are repeated until the β value becomes two. If there are two β values that are against monotonous increase or monotonous decrease with respect to the change in recording power (S5), the process proceeds to step 6 (S6) and thereafter. After step 6 (S6), the β value including the error is specified and the β value including the error is corrected. If the β value that is monotonically increasing or decreasing with respect to the recording power change is 1 or less (S5), the process proceeds to step 13 (S13), and the optimum recording power is determined by the approximate line and the target β. To do.

  In specifying a β value including an error, first, when a plurality of calculated β values are arranged in ascending or descending order using the recording power used to calculate the β value as an index, at least three β values are consecutive. The difference between two consecutive β values among the β values that monotonously increase or decrease monotonically is defined as X (S6). Further, a difference between the β value that appears against the monotonic increase or monotonic decrease that appears first and the β value that is monotonically increased or monotonically located next to the β value is defined as Y (S6). Further, Z is defined as the difference between the β value that contradicts the second monotonic increase or monotonic decrease and the β value that is monotonically increased or monotonically located next to the β value (S6). Thereafter, it is confirmed whether Y = Z (S7). Here, if Y = Z is not satisfied, the process proceeds to step 8 (S8) and subsequent steps. If Y = Z, the process returns to step 2 (S2), and steps 2 (S2) to 7 (S7) are performed until Y is not Z. Repeat the operation.

  Next, case classification is performed using a predetermined mathematical expression using the value defined in step 6 (S6) (S8). The predetermined mathematical formula used here is | 2X−Y |> | 2X−Z |. If the mathematical formula | 2X−Y |> | 2X−Z | is satisfied, the process proceeds to Step 9 (S9). If | 2X−Y |> | 2X−Z | is not satisfied, the process proceeds to step 11 (S11). Since the predetermined mathematical formula used here is mathematical formula | 2X−Y |> | 2X−Z |, the β value including the error can be detected more reliably.

  When the expression | 2X−Y |> | 2X−Z | is satisfied and the process proceeds to Step 9 (S9), the case is divided using a predetermined expression using the value defined in Step 6 (S6). The predetermined mathematical formula used here is 3X> Z> X, and when the mathematical formula 3X> Z> X is satisfied, correction of the β value contrary to the monotonic increase or monotonic decrease that appears first is performed (S10). In this correction of the β value, the β value that appears against the first monotonic increase or monotonic decrease is replaced with an average value obtained by averaging the β values on both sides of the β value. When the predetermined mathematical formula used here is 3X> Z> X, it is possible to more reliably detect the β value including the error.

  Further, if the formula | 2X−Y |> | 2X−Z | is not satisfied and the process proceeds to step 11 (S11), the case classification is performed using a predetermined formula using the value defined in step 6 (S6). . The predetermined mathematical formula used here is 3X> Y> X, and when the mathematical formula 3X> Y> X is satisfied, correction of the β value contrary to the second monotonic increase or monotonic decrease that appears second is performed (S12). In the correction of the β value, the β value that appears against the second monotonic increase or monotonic decrease is replaced with an average value obtained by averaging the β values on both sides of the β value. When the predetermined mathematical formula used here is 3X> Y> X, it is possible to more reliably detect the β value including the error.

  If Equation 3X> Z> X is not satisfied in Step 9 (S9), or if Equation 3X> Y> X is not satisfied in Step 11 (S11), the operation of Step 2 (S2) is performed in either case. Return to step 2 (S2) to step 9 (S9) or step until the β value against the monotonous increase or the monotonic decrease becomes two, and the mathematical expression 3X> Z> X or the mathematical expression 3X> Y> X is satisfied. 2 (S2) to Step 11 (S11) are repeated.

  In step 10 (S10) or step 12 (S12), when the β value is corrected against the monotonic increase or the monotonic decrease, the approximate line calculated from the β value including the corrected β value and the target β value are obtained. Based on this, the recording power is determined (S13).

  In the present embodiment, ten types of setting values are set for the recording power optimization process by the control circuit 10, but the set values to be set are not limited to ten types. Nine types or eleven types may be used. As the set value increases, the accuracy of the optimum value by the recording power optimization process increases, and as the set value decreases, the accuracy of the optimum value by the recording power optimization process decreases.

  In the present embodiment, the recording power optimization process is performed in the test writing area of the optical disc 1, but the present invention is not limited to this. Since the recording power optimization process is performed in the test writing area of the optical disc 1, it is not necessary to write unstable recording quality data in the user data recording area where recording is performed in accordance with a user instruction.

  Next, details of the operation for detecting the β value including an error based on Step 6 (S6) to Step 10 (S10) or Step 6 (S6) to Step 12 (S12) shown in FIG. Details will be described with reference to FIG.

  3 to 5 are diagrams showing the relationship between the recording power and the β value in one embodiment of the present invention, where the horizontal axis represents the recording power and the vertical axis represents the β value. 3 to 5, 101 to 110, 114, 121 to 130, 135, and 141 to 150 are β values.

  There are three forms in which the β value including the error appears as shown in FIGS. In the following, details of operations for detecting a β value including an error in these three forms will be described in order.

  FIG. 3 shows a case where the β value including the error is the β value 104. In the form shown in FIG. 3, first, a β value including an error is specified in step 6 (S6).

  In specifying a β value including an error, first, when a plurality of calculated β values are arranged in ascending or descending order using the recording power used to calculate the β value as an index, at least three β values are consecutive. The difference between two consecutive β values among the β values that monotonously increase or decrease monotonically is defined as X (S6). Here, the two β values are defined as β value 102 and β value 103, and the difference between the two β values is defined as X.

  Further, a difference between the β value that appears against the monotonic increase or monotonic decrease that appears first and the β value that is monotonically increased or monotonically located next to the β value is defined as Y (S6). Here, the β value 104 that is contrary to the monotonic increase or decrease that appears first is the β value 104, and the β value that is monotonically increasing or decreasing monotonically located next to the β value 104 is the β value 102. The difference between the two β values is defined as Y.

  Further, Z is defined as the difference between the β value that contradicts the second monotonic increase or monotonic decrease and the β value that is monotonically increased or monotonically located next to the β value (S6). Here, the β value 105 opposite to the monotonically increasing or decreasing monotone that appears second is the β value 105, and the β value 105 that is monotonically increasing or decreasing monotonically located next to the β value 105 is the β value 103. The difference between the two β values is defined as Z.

  Thereafter, it is confirmed whether Y = Z (S7). In the form shown in FIG. 3, since Y = Z is not satisfied, the process proceeds to step 8 (S8).

  Next, in step 8 (S8), cases are classified using a predetermined mathematical expression | 2X−Y |> | 2X−Z | using the value defined in step 6 (S6). In the form shown in FIG. 3, Z = 2X, Y> 2X, and in order to satisfy the expression | 2X−Y |> | 2X−Z |, the process proceeds to step 9 (S9).

  In step 9 (S9), the case is divided by Equation 3X> Z> X. In the form shown in FIG. 3, since Z = 2X and satisfies the expression 3X> Z> X, the process proceeds from step 10 (S10) to step 13 (S13).

  In this way, the β value 104 can be detected as a β value including an error, and the β value 104 can be corrected to the β value 114. Further, when the expression | 2X−Y |> | 2X−Z | is satisfied and the expression 3X> Z> X is satisfied, by correcting the β value that is contrary to the monotonic increase or monotonic decrease that appears first, The β value including the error can be easily determined from the β values that may include the error.

  FIG. 4 shows a case where the β value including the error is the β value 125. In the form shown in FIG. 4, first, a β value including an error is specified in step 6 (S6).

  In specifying a β value including an error, first, when a plurality of calculated β values are arranged in ascending or descending order using the recording power used to calculate the β value as an index, at least three β values are consecutive. The difference between two consecutive β values among the β values that monotonously increase or decrease monotonically is defined as X (S6). Here, two β values are defined as β value 122 and β value 123, and the difference between the two β values is defined as X.

  Further, a difference between the β value that appears against the monotonic increase or monotonic decrease that appears first and the β value that is monotonically increased or monotonically located next to the β value is defined as Y (S6). Here, the β value 124 that is contrary to the monotonic increase or decrease that appears first is the β value 124, and the β value 124 that is monotonically increasing or decreasing monotonically adjacent to the β value 124 is the β value 122. The difference in β value is defined as Y.

  Further, Z is defined as the difference between the β value that contradicts the second monotonic increase or monotonic decrease and the β value that is monotonically increased or monotonically located next to the β value (S6). Here, β value 125 that is the second monotonically increasing or decreasing monotonically appearing is β value 125, and β value that is monotonically increasing or decreasing monotonically adjacent to the β value is β value 123. The difference between the two β values is defined as Z.

  Thereafter, it is confirmed whether Y = Z (S7). In the form shown in FIG. 4, since Y = Z is not satisfied, the process proceeds to step 8 (S8).

  Next, in step 8 (S8), cases are classified using a predetermined mathematical expression | 2X−Y |> | 2X−Z | using the value defined in step 6 (S6). In the form shown in FIG. 4, Y = 2X, and in order to satisfy the expression | 2X−Y |> | 2X−Z |, the process proceeds to Step 11 (S11).

  In step 11 (S11), the case is divided by the mathematical formula 3X> Y> X. In the form shown in FIG. 4, Y = 2X, and since Formula 3X> Y> X is satisfied, the process proceeds to step 12 (S12) and step 13 (S13) in this order.

  In this way, it is possible to detect the β value 125 as a β value including an error, and the β value 125 can be corrected to the β value 135. Further, when the expression | 2X−Y |> | 2X−Z | is not satisfied and the expression 3X> Z> X is satisfied, the β value that is contrary to the second monotonic increase or monotonic decrease is corrected. Thus, it is possible to easily determine a β value including an error from β values that may include an error.

  FIG. 5 shows a case where there are two β values including an error, and the β values are a β value 144 and a β value 145. In the form shown in FIG. 5, first, in step 6 (S6), a β value including an error is specified.

  In specifying a β value including an error, first, when a plurality of calculated β values are arranged in ascending or descending order using the recording power used to calculate the β value as an index, at least three β values are consecutive. The difference between two consecutive β values among the β values that monotonously increase or decrease monotonically is defined as X (S6). Here, two β values are defined as β value 142 and β value 143, and the difference between the two β values is defined as X.

  Further, a difference between the β value that appears against the monotonic increase or monotonic decrease that appears first and the β value that is monotonically increased or monotonically located next to the β value is defined as Y (S6). Here, β value 144 that is contrary to the monotonic increase or monotonic decrease that appears first is β value 144, and β value 142 that is monotonically increasing or monotonically decreasing adjacent to β value 144 is β value 142. The difference in β value is defined as Y.

  Further, Z is defined as the difference between the β value that contradicts the second monotonic increase or monotonic decrease and the β value that is monotonically increased or monotonically located next to the β value (S6). Here, the β value 145 that is contrary to the monotonic increase or decrease that appears second is the β value 145, and the β value that is monotonically increasing or decreasing adjacent to the β value is the β value 143. The difference between the two β values is defined as Z.

  Thereafter, it is confirmed whether Y = Z (S7). In the form shown in FIG. 5, since Y = Z is not satisfied, the process proceeds to step 8 (S8).

  Next, in step 8 (S8), cases are classified using a predetermined mathematical expression | 2X−Y |> | 2X−Z | using the value defined in step 6 (S6). In the form shown in FIG. 5, depending on the values of Y and Z, there are cases where the expression | 2X−Y |> | 2X−Z |

  When the expression | 2X−Y |> | 2X−Z | is satisfied and the process proceeds to Step 9 (S9), the case is divided by Expression 3X> Z> X. In this case, the case where the β value to be corrected by the expression | 2X−Y |> | 2X−Z | cannot be detected is removed. The form shown in FIG. 5 is a form in which the β value to be corrected cannot be detected by the expression | 2X−Y |> | 2X−Z | when the expression 3X> Z> X is not satisfied, that is, step 2 (S2). Step 2 (S2) to Step 9 (S9) until the β value against the monotonous increase or the monotonous decrease becomes two and the mathematical expression 3X> Z> X or the mathematical expression 3X> Y> X is satisfied. ) Or step 2 (S2) to step 11 (S11).

  On the other hand, when the process proceeds to step 11 (S11) without satisfying the expression | 2X−Y |> | 2X−Z |, the case is divided by the expression 3X> Y> X. In this case, the case where the β value to be corrected by the expression | 2X−Y |> | 2X−Z | cannot be detected is removed. The form shown in FIG. 5 is a form in which the β value to be corrected cannot be detected by the expression | 2X−Y |> | 2X−Z | when the expression 3X> Y> X is not satisfied, that is, step 2 (S2). Step 2 (S2) to Step 9 until the β value which is contrary to the monotonic increase or monotonic decrease becomes two and the mathematical expression 3X> Z> X or the mathematical expression 3X> Y> X is satisfied. The operation of (S9) or step 2 (S2) to step 11 (S11) is repeated.

  As described above, when the β value including the error cannot be detected by the expression | 2X−Y |> | 2X−Z |, the steps 2 (S2) to 9 (S9) are performed until the β value to be corrected can be detected. ) Or step 2 (S2) to step 11 (S11).

  As described above, when performing the recording power optimization process, a plurality of β values are calculated based on the plurality of recording powers, and at least a part of the calculated β values are compared based on a predetermined mathematical expression. This makes it possible to correctly detect the β value including the error.

  Therefore, when performing the recording power optimization process, the β value to be corrected can be correctly grasped, and the accuracy of the optimum value can be improved by the recording power optimization process, and the optical disk apparatus recording method An apparatus can be realized.

  In the present invention, when performing the recording power optimization process, it is possible to correctly detect the β value including an error, and the accuracy of the optimum value can be improved by the recording power optimization process. The present invention can be applied to a recording method of an optical disc apparatus that performs recording, an optical disc apparatus, and the like.

1 is a block diagram of a recording power control system of an optical disc apparatus according to an embodiment of the present invention. 6 is a flowchart showing recording power optimization processing of the optical disc apparatus according to the embodiment of the present invention. The figure which shows the relationship between the recording power and beta value in one embodiment of this invention The figure which shows the relationship between the recording power and beta value in one embodiment of this invention The figure which shows the relationship between the recording power and beta value in one embodiment of this invention Block diagram of recording power control system in conventional optical disc apparatus The figure which shows the relationship between the recording power and beta value in the conventional optical disk apparatus The figure which shows the relationship between the recording power and beta value in the conventional optical disk apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk 2 Optical pick-up 3 Reproduction signal detection circuit 4 Spindle motor 5 Traverse mechanism 6 Laser drive circuit 7 Recording control circuit 8 Servo control circuit 9 β detection circuit 10 Control circuit 11 Pickup module 101-110 β value 114 β value 121-130 β Value 134 β value 135 β value 141-150 β value

Claims (8)

When performing the recording power optimization process, a plurality of β values are calculated based on a plurality of recording powers,
A recording method of an optical disc apparatus, wherein at least a part of the calculated β value is compared based on a predetermined mathematical formula. Using the recording power used for calculating the β value as an index, the calculated β values are arranged in ascending or descending order,
The difference between two consecutive β values among β values in which at least three β values continuously increase or decrease monotonically is defined as X,
Y is defined as the difference between the β value contrary to the monotonic increase or monotonic decrease that appears first and the β value that monotonically increases or decreases that is located next to the β value,
When Z is defined as the difference between the β value that appears against the second monotonic increase or decrease, and the β value that monotonically increases or decreases that is located next to the β value,
The predetermined formula is
| 2X-Y |> | 2X-Z |
The recording method for an optical disc apparatus according to claim 1, wherein: Using the recording power used for calculating the β value as an index, the calculated β values are arranged in ascending or descending order,
The difference between two consecutive β values among β values in which at least three β values continuously increase or decrease monotonically is defined as X,
Y is defined as the difference between the β value contrary to the monotonic increase or monotonic decrease that appears first and the β value that monotonically increases or decreases that is located next to the β value,
When Z is defined as the difference between the β value that appears against the second monotonic increase or decrease, and the β value that monotonically increases or decreases that is located next to the β value,
The predetermined formula is
3X>Z> X or 3X>Y> X
The recording method for an optical disc apparatus according to claim 1, wherein the recording method is represented by: When satisfying the formula | 2X−Y |> | 2X−Z | and satisfying the formula 3X>Z> X,
4. The recording method for an optical disk device according to claim 2, wherein a β value that is contrary to the monotonic increase or monotonic decrease that appears first is corrected. When not satisfying the formula | 2X−Y |> | 2X−Z | and satisfying the formula 3X>Y> X,
4. The recording method for an optical disc apparatus according to claim 2, wherein a β value that is contrary to the second monotonic increase or monotonic decrease is corrected. RF drive based on rotation drive means for rotating the optical disc, an optical pickup for recording information on the optical disc, a laser drive circuit for controlling the amount of laser light emitted from the optical pickup, and a signal obtained from the optical pickup A reproduction signal detection circuit that generates a signal; a β detection circuit that calculates a β value based on the RF signal; and a control unit that calculates the β value, and the control unit performs a recording power optimization process In this case, an optical disc apparatus characterized in that a plurality of β values are calculated based on a plurality of recording powers, and at least a part of the calculated β values are compared based on a predetermined mathematical expression. Using the recording power used for calculating the β value as an index, the calculated β values are arranged in ascending or descending order,
The difference between two consecutive β values among β values in which at least three β values continuously increase or decrease monotonically is defined as X,
Y is defined as the difference between the β value contrary to the monotonic increase or monotonic decrease that appears first and the β value that monotonically increases or decreases that is located next to the β value,
When Z is defined as the difference between the β value that appears against the second monotonic increase or decrease, and the β value that monotonically increases or decreases that is located next to the β value,
The predetermined formula is
| 2X-Y |> | 2X-Z |
The optical disk apparatus according to claim 6, wherein: Using the recording power used for calculating the β value as an index, the calculated β values are arranged in ascending or descending order,
The difference between two consecutive β values among β values in which at least three β values continuously increase or decrease monotonically is defined as X,
Y is defined as the difference between the β value contrary to the monotonic increase or monotonic decrease that appears first and the β value that monotonically increases or decreases that is located next to the β value,
When Z is defined as the difference between the β value that appears against the second monotonic increase or decrease, and the β value that monotonically increases or decreases that is located next to the β value,
The predetermined formula is
3X>Z> X or 3X>Y> X
The optical disk apparatus according to claim 6, wherein the optical disk apparatus is represented by:

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